Hi, Some place with a ground without particular function so, how to add aspahlt surface as we could add grassland or also rocky area ? I don't see a surface that called like this. If i use an other surafce with a different tag than that original, the color will not like asphalt or other.

In a nutshell, most of the time surface is an additional tag for the object and is tagged like surface=, but if you have no idea about anything beside it, you can use standalone landcover= tag, for example:

The surface key is most commonly used as an additional tag, but there's nothing stopping you from using it on its own. To me, that makes more sense than duplicating most of the value list of surface with a different key (landcover).